Yeah but the sti also had the dccd so wots the one to go for
From my research the DCCD just splits the power , so those cars still have the same rear diff ,
Which one to go for ? I suppose that depends what you are after really?
AP suretrac's use normal hypoid oil and don't need any adjustment but if you lift a wheel they go back to open ,
Clutch LSD, need special oil and can be adjusted for different grab , but will need a clutch pack one day , ( probably the best type )
Viscous and torsen, I have no experience of only what I have read,